What is the best definition of realpolitik?

politics centered on the ideals and hope of everyday people
politics focused on real change through peaceful means
politics based on power and practical facts rather than ideals
politics aimed at provoking real discussion among leaders

The best definition of realpolitik is the type of politics based on power and practical facts rather than ideals. The correct option among all the options given in the question is the third option. This is the term that has sometimes referred to as pragmatism in common politics. It has to be mentioned that it would be improper to compare realpolitik with the philosophy of political realism. 

One major effect of industrialization on American society was more people moved to urban areas (Point  D).

Further explanation

American industrialization starts around the 1800s. Industrialization means changing the industry from manual labors to machine base industry - to increase productivity and maximize profit.

Industrialization occurred because of innovation, technology and transportation development. Industrialization offered new jobs resulted in urbanization. Many people moved from the farm or countryside to urban areas in search of employment or to live near the factories.  

Industrial Revolution brought significant social changes in the United States. Most of the new industrial company built near to the urban area resulted the city grew faster than ever before. Chicago was the fastest growing city. This growing city faced a new social problem, the increased inequality of wealth was most visible, the gap between the high with the lower-income become wider. The revolution also caused a rise of unskilled workers, poor working condition, low wages, and child labor.  

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Textile industry

Manufacture industry that employs more workers

American industrial revolutions

Keywords: Industrialization in America, a major effect of industrialization, urban area, rural area, American industrial revolution, urbanization